高Crフェライト系耐熱鋼のクリープ強化においてBと複合添加したW,NbおよびVの影響

概要

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In order to investigate the effect of the combined addition of W, Nb and V with B on the creep strengthening of high Cr ferritic heat resistant steel, the creep tests and the microstructural observation of crept specimen were carried out. The effect of adding B on the creep strengthening was discussed. In based steel and V free steel, the short time creep strength increases with adding B. In W free steel and Nb free steel, however, the short time creep strength of B adding steel is similar to that of B free steel. In based steel, W free steel and Nb free steel, the long term creep strengthening by adding B occurs. The suppression of microstructural recovery by adding B dose not occur in short time crept specimen of W free steel. It is suggested that the addition of B contributes to the creep strengthening through two mechanisms. One is the long term creep strengthening by stabilizing precipitates such as M_<23>C_6, Laves phase. And another is the short time creep strengthening by refining of MX, increasing the latent creep resistance and synergetic effect of alloying elements.
社団法人日本鉄鋼協会の論文